Data extraction and management
Two independent authors (MLN and ACAS) extracted data from the eligible
and included studies. The latter were inserted into a database following
the designed form: publication year, first author, number of patients
per group, intervention description, control group description, number
of complications, number of missed paranasal sinuses, mean estimated
blood loss, and mean operative time. A meta-analysis was conducted on
the outcomes that could be combined.